Fig. 7From: Numerical simulation study on effectiveness of shielding structure on ultrasonic transmission tomographyThe time domain and frequency domain signal of received direct waves with different w and h of shielding structures: a w = 10 mm (a1) time domain, (a2) frequency domain, b w = 20 mm (b1) time domain, (b2) frequency domain, c w = 30 mm (c1) time domain, (c2) frequency domain, and d w = 40 mm (d1) time domain, (d2) frequency domainBack to article page